1个master，2个slave，多次格式化删除/usr/local/hadoop/logs与/tmp无效
报错日志显示：
2019-05-22 15:43:46,212 WARN org.apache.hadoop.hdfs.server.datanode.DataNode: Problem connecting to server: Master/219.226.109.130:9000
但是所有节点防火墙均为关闭状态
/etc/hosts中配置均为：
#127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
#::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
219.226.109.130 Master
219.226.109.129 Slave1
219.226.109.131 Slave2